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IMP706CSA Datasheet(PDF) 4 Page - IMP, Inc |
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IMP706CSA Datasheet(HTML) 4 Page - IMP, Inc |
4 / 9 page 4 408-432-9100/www.impweb.com © 1999 IMP, Inc. IMP705/6/7/8, 8 IMP705/6/7/8, 8113L 3L Pin Descriptions Feature Summary Pin Number IMP705/706 IMP707/708 IMP813L DIP/SO MicroSO DIP/SO MicroSO DIP/SO MicroSO Name Function Manual RESET input. The active LOW input triggers a reset 1 3 1 3 1 3 MR pulse. A 250 µA pull-up current allows the pin to be driven by TTL / CMOS logic or shorted to ground with a switch. 2 424 2 4 VCC +5V power supply input. 3 5 3 5 3 5 GND Ground reference for all signals. Power-fail voltage monitor input. With PFI less than 4 6 4 6 4 6 PFI 1.25V, PFO goes low. Connect PFI to ground or VCC when not used. 5 7 5 7 5 7 PFO Power-fail output. The output is active LOW and sinks current when PFI is less than 1.25V. Watchdog input. WDI controls the internal watchdog timer. A HIGH or LOW signal for 1.6sec at WDI allows the internal timer to run-out, setting WDO LOW. 68 —— 6 8 WDI The watchdog function is disabled by floating WDI or by connecting WDI to a high-impedance three-state buffer. The internal watchdog timer clears when: RESET is asserted; WDI is three-stated; or WDI sees a rising or falling edge. —— 6 —— — NC Not connected. Active-LOW reset output. Pulses LOW for 200ms when triggered, and stays low whenever VCC is below the reset threshold (IMP705: 4.65V, IMP705J: 4.00V, 7 171 —— RESET IMP706: 4.40V). RESET remains LOW for 200ms after VCC rises above the RESET threshold or MR goes from LOW to HIGH. A watchdog timeout will not trigger RESET unless WDO is connected to MR. Watchdog output. WDO pulls LOW when the 1.6 sec internal watchdog timer times-out and does not go HIGH until the watchdog is cleared. In addition, when 82 —— 8 2 WDO VCC is below the reset threshold, WDO remains low. Unlike RESET, WDO does not have a minimum pulse width and as soon as VCC exceeds the reset threshold, WDO goes HIGH with no delay. —— 8 2 7 1 RESET Active-HIGH reset output . RESET is the inverse of RESET. The IMP813L has only a RESET output. IMP705 IMP706 IMP707 IMP708 IMP813L Power-fail detector I I III Brownout detection I I III Manual RESET input I I III Power-up/down RESET I I III Watchdog timer II I Active-HIGH RESET output III Active-LOW RESET output II I I RESET threshold 4.65V/4.00V 4.40V 4.65V 4.40V 4.65V |
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